How to use multiple value variable in PromQL query?

Grafana Prometheus
1

Hi all,

I would like to use a multi value variable in a query.

In a test dashboard I have a variable (group) that identifies various devices in my lan

The variable shows correctly the groups from smokeping-prober

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and it works correctly if I select only one group

the query is defined as

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The query is

sum by(host) (rate(smokeping_response_duration_seconds_sum{group="$GROUP"}[$__rate_interval]))

Selecting “All” or more than 1 value gives a “No data” panel

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What I’m doing wrong?

BTW if it can be of any interest the smokeping-prober yaml file is

---
targets:
- hosts:
  - cloudflare-dns
  - google-dns
  labels:
    group: dns

- hosts:
  - nexxt-int
  - p9-principale-ext
  labels:
    group: net1-device

- hosts:
  - mostro
  - kit-studio
  labels:
    group: net1-server

- hosts:
  - bianco500
  labels:
    group: net68-server

  interval: 1s # Duration, Default 1s.
  network: ip # One of ip, ip4, ip6. Default: ip (automatic IPv4/IPv6)
  protocol: icmp # One of icmp, udp. Default: icmp (Requires privileged operation)
  size: 56 # Packet data size in bytes. Default 56 (Range: 24 - 65535)
2

Found the solution: add “~” to the query

sum by(host) (rate(smokeping_response_duration_seconds_sum{group=~"$GROUP"}[$__rate_interval]))